Adjustable scraper for roller-mills.



F. STACEY.

ADJUSTABLE SCRA'PER FOR ROLLER MILLS.

APPLICATION FILED DEC. 7, m2.

1,139,236. Patented May 11, 1915.

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FRANK STACEY,

OF BIRMINGHAM, ENGLAND.

ADJUSTABLE SCRAPER. FOR ROLLER-MILLS.

Application filed December 7, 1912.

To all whom it may concern:

Be it known that I, FRANK STACEY, sub ject of the King of Great Britain, residing at Vauxhall street, in the city of Birmingham, county of Warwick, England, have invented certain new and useful Adjustable Scrapers for Roller-Mills; and I do hereby declare that the following is a full, clear, and exact description of the same.

The invention provides the hereinafter described and claimed improvements in the clearing or scraping of stock from the pe ripheries of smooth surfaced rolls used for flour milling and similar operations.

The objects of the invention are first to provide an easily adjustable roll-contacting piece which can be repeatedly set up at any I point in its length or for its full length to prevent ringing; second to provide a rollcontacting piece operating without generating objectionable heat and which will wear Well; and third to facilitate the renewal of said piece and its quick removal in case of need.

The word ringing is a term used by millers to describe a circular layer of stock adhering to the roll and which layer needs to be cleared by the roll contacting piece.

The cleaner or scraper according to the invention is a roll-contacting piece which is flexible such for example as a strip of rawhide and which will operate without generating objectionable heat. Said piece is car'- ried by a holder so that it may for either its full length or any portion of its length be repeatedly set up to the roll surface to prevent ringing and such like of the stock and to compensate for wear. The holder is longitudinally grooved to receive and hold the raw-hide or like strip and a resilient metal rod at the back of the roll-contacting strip and within the groove of the holder operates between the setting up screw pins and said roll-contacting strip. The ends of the holder are supported within opposite brackets attached to the wood linings of the roll frames and are made detachable therefrom by removable cross bars of said brackets against which the ends of the holder abut when the roll-contacting piece is in operation. Integral portions of the brackets are let into the wood linings of the roll frames to relieve the attachment screws of said brackets of strains.

The invention is hereinafter described with reference to the drawings.

Specification of Letters Patent.

Patented May 11, 1915.

Serial No. 735,516.

Figure l is a diagrammatic plan of a smooth surfaced flour milling roll and part of the wood linings of the frames with the invention applied. Fig. 2 is an enlarged transverse section of a portion of Fig. 1. Fig. 3 is a similar transverse section as Fig. 2 but with the holder and roll-contacting piece removed from the brackets.

The clearer or roll-contacting piece is represented at a extending from a to a approximately the full length of the roll 0 which latter is positioned in the usual roll frames provided with wood linings indicated at a? d. The piece a is a raw-hide strip having a predetermined amount of flexibility and is carried by a rigidly built stationary holder e hereinafter more particularly described, within which said strip is adjustable at any point in its length to set its working face a into close contact with the roll surface, the slight flexibility of the strip admitting of any portion of said strip being deformed from a straight line without interfering with adjacent portions of said strip. The holder 6 has a longitudinal groove 6 into which the rear portion of the raw-hide strip fits but between the rear longitudinal edge a of said strip and the bottom 6 of the groove is inserted a bendable or resilient metal rod or equivalent device f against which the ends of a number of adjusting screw pins 9 carried by the holder 6 operate in a direction to force the rod f and therefore the strip a outwardly from the groove toward the rolls periphery. The metal rod 7 is the full length of the rawhide strip. The screw pins 9 are placed only a short distance apart in the length of the holder and each is independent in its operation so that by screwing up one or two adjacent ones the opposite portion of the raw-hide strip is set up to the roll surface without further setting up any other portions of the strip a, the metal rod f providing simply a flexibleintervening piece between the ends of the screw pins and the longitudinal edge of the raw-hide strip a. Each adjusting screw 9 has a milled head 9 and also a lock nut 9 the latter for fixing the position of the screw upon the holder after adjustment.

The cross sectional shapes of the groove 6 the raw-hide or other strip a, and the meta'lrod f, and the manner the two latter fit said groove are clearly represented by Figs. 2 and 3.

The holder e is supported at its ends from the wood linings 03 (Z of the roll frames by opposite brackets h it permanently secured to said linings. Said brackets provide on the Wood linings opposite grooves 71, 7L2 (both brackets being alike in construction) into Which the opposite ends of the holder are simultaneously slid when putting the combined holder and strip into position in relation to the roll 0, said ends of the holder being afterward secured within the groove by attachable cross bars 72, it' of said brackets fixed to the bracket. by screw bolts 2', the backs of the ends of the holder 6 abutting against these cross bars as supports while the clearer or scraper is in operation against the roll periphery. The cross bars 7L are applied one to each bracket and preferably as shown in the drawings so that by unloosening one nut of the screw pin 2' the cross bar can swing out of position to open the groove in the manner represented by Fig. 3 said cross bar when in position with the back of the end of the holder abutting against it being clearly shown by Fig. 2, there being a slot formation j within the free end of the swinging bar to engage the particular bolt 71.

The bolts 2' z are provided with springs m and made to slide within the parts of the bracket carrying them against the action of said springs so that the back abutment bars 72, for the holder can give when very heavy pressure is applied by the roll 0 against the clearer strip a as would be the case in temporarily separating the rolls or shifting them for any particular purpose, these springs however not having any effect in the actual setting of the raw-hide strip a up, to the roll surface while the rolls are in operation. The brackets h k may carry integral portions 0 let into the wood linings d to provide positioning abutments for said brackets to take the strains ofi' the attach ment screws of said brackets.

The invention is not to be limited to the use of raw-hide to provide the roll contact ing piece a but said piece must be of a suitablematerial which has flexibility enabling any particular portion of said strip to be independently set up to the roll surface to take out a ringing on the roll. Any number of screw pins 9 may be used at any suitable distances apart and it is not necessary to use the metal rod 7 but preferable only.

Having now described my invention what I claim and desire to secure by Letters Pat ent is:

1. In combination, a roll scraper comprising a longitudinally grooved rigid bar and a flexible roll engaging strip adjustably fitted in the groove in said bar, and brackets supporting said bar and arranged to provide grooves in which the ends of said bar engage, said brackets including pivotally mounted cross bars which form the bases of said grooves and provide bearings for the bar of said scraper and which may be moved pivotally to withdraw their support from the bar of said scraper, and spring means holding said cross bars in normal position in opposition to the pressure exerted against the same by said scraper bar and permitting movement of said cross bars in the direction of the depth of said grooves.

2. In combination, a roll scraper comprising a longitudinally grooved rigid bar, and a flexible roll engaging strip fitted in the groove in said bar; and brackets supporting said bar and arranged to provide grooves in which the ends of said bar engage, the brackets including cross bars which form the bases of said grooves, bolts holding the cross bars to the bodies of the brackets,and springs upon said bolts acting in opposition to the pressure exerted by said scraper bar against said cross bars, the cross bars being mounted pivotally at one end thereof on one of their attachment bolts and at their other ends having slots to engage over the other attachment bolts.

Signed at Birmingham, in the county of Warwick, England, this twenty-seventh day of November 1912.

FRANK STACEY. Witnesses:

GEO. FUERY, BERNARD H. TINGLE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. I 

